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If you only use PET bottle try to put a neoprene sleeve around them. Neoprene is used to insulate the tubes of the so called "hydration systems", that is those bladders with a tube going from the ...
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If you only use PET bottle try to put a neoprene sleeve around them. Neoprene is used to insulate the tubes of the so called "hydration systems", that is those bladders with a tube going from the ...